schmookeeg
En-Route
Just thinking for fun here:
(I don't know the exact process, but here's the concept anyway.) Build an ultralight kit. Something like a Quicksilver - or whatever, basically the cheapest flying tricycle design you can find. Quicksilver advertises their Sport MX can be built in 30-40 hours. But plan to register it as an experimental, amateur-built (so it has an N-number and the time can count as airplane time).
As you build it, add another engine. Does this need to be a "normal" engine? I have no idea. Can it be an electric motor with a little propeller, like a drone motor/propeller, that provides no useful thrust? Just attach it any old place, on a wing strut or something. Would this count as a "multiengine" airplane? Fly it around burning <3 gph gaining lots of "multiengine" time but absolutely zero useful multiengine experience.
Have I discovered the ultimate loophole here? I want someone to show up at their airline interview with 1500 hours of multiengine Quicksilver time and let us know how it goes.
Using that logic, you can fly a C150 wearing some sort of motorized propeller beanie and log it as MEL